Empty files causing LS to throw errors

[Munsio]

Hey running the extension with nixd LS and when I open an empty .nix file I always get a lot of errors inside VSCode because the LS is unable to generate the AST from the file.

Technically it is a valid error from LS but it is very annoying inside VSCode, so I would suggest to suppress this particular error if the file content is empty.

On the other hand if there is a configuration to avoid this behavior, then I would suggest to put it into a "possible default" documentation section or similar.

Error message:

I[12:28:37.526] 2177: <-- textDocument/codeAction(857)
I[12:28:37.526] 2177: --> reply:textDocument/codeAction(857)
I[12:28:37.544] 2177: <-- textDocument/documentLink(858)
I[12:28:37.544] 2177: --> reply:textDocument/documentLink(858) AST is null on this unit, error: 3
I[12:28:37.544] 2177: <-- textDocument/inlayHint(859)
I[12:28:37.544] 2177: --> reply:textDocument/inlayHint(859) AST is null on this unit, error: 3
[Error - 12:28:37 PM] Request textDocument/documentLink failed.
  Message: AST is null on this unit
  Code: -32001 
[Error - 12:28:37 PM] Request textDocument/inlayHint failed.
  Message: AST is null on this unit
  Code: -32001 
I[12:28:37.823] 2177: <-- textDocument/semanticTokens/full(860)
I[12:28:37.823] 2177: --> reply:textDocument/semanticTokens/full(860) AST is null on this unit, error: 3
[Error - 12:28:37 PM] Request textDocument/semanticTokens/full failed.
  Message: AST is null on this unit
  Code: -32001 
I[12:28:37.830] 2177: <-- textDocument/documentSymbol(861)
I[12:28:37.830] 2177: --> reply:textDocument/documentSymbol(861) AST is null on this unit, error: 3
[Error - 12:28:37 PM] Request textDocument/documentSymbol failed.
  Message: AST is null on this unit
  Code: -32001 

If you need anything else just ask and I try to provide all the information needed.

[inclyc]

This is fixed in nixd 2.2.2

[DylanBulfin]

Could be something with my configuration since I'm pretty new to nix(OS), but I'm still seeing the same behavior with nixd 2.2.2 and nix-ide 0.3.1 (both from nixpkgs-unstable)

[inclyc]

Yes, that's partially fixed (in 2.2.2), you can see the release notes.

[myned]

From the 2.2.2 release notes:

null AST is still emitting errors. Should be fixed in the next release.

It should be fixed in nixd 2.2.3.